US9864171B2ActiveUtilityPatentIndex 93
Optical photographing lens assembly, image capturing device and electronic device

Assignee: LARGAN PRECISION CO LTDPriority: Jul 24, 2015Filed: Aug 25, 2015Granted: Jan 9, 2018
Est. expiryJul 24, 2035(~9.1 yrs left)· nominal 20-yr term from priority
Inventors:HSIEH DUNG-YI CHEN CHUN-YEN HSUEH CHUN-CHE HUANG HSIN-HSUAN
G02B 13/0045G02B 9/60
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Claims
Abstract

An optical photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The second lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The third lens element has two surfaces being both aspheric. The fourth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, wherein two surfaces thereof are aspheric. The fifth lens element has an image-side surface being convex in a paraxial region thereof, wherein two surfaces thereof are aspheric.
Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. An optical photographing lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof; 
 a second lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof; 
 a third lens element having an object-side surface and an image-side surface being both aspheric; 
 a fourth lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric; and 
 a fifth lens element having an image-side surface being convex in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric; 
 wherein the optical photographing lens assembly has a total of five lens elements, there is an air space between every two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element that are adjacent to each other, a focal length of the first lens element is f1, a focal length of the third lens element is f3, an axial distance between the image-side surface of the fifth lens element and an image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, and the following conditions are satisfied:
     f 1/ f 3&lt;0.65; 
     BL/TD&lt; 0.80; 
     R 1&lt; R 2; and 
     T 23/ T 34&lt;1.80. 
 
 
     
     
       2. The optical photographing lens assembly of  claim 1 , wherein the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, and the following condition is satisfied:
   ( R 1+ R 2)/( R 1− R 2)&lt;−1.0.
 
 
     
     
       3. The optical photographing lens assembly of  claim 2 , wherein the image-side surface of the fourth lens element comprises at least one convex shape in an off-axial region thereof. 
     
     
       4. The optical photographing lens assembly of  claim 2 , further comprising:
 a stop, wherein there is no lens element located between the stop and the first lens element, an axial distance between the stop and the image-side surface of the fifth lens element is SD, the axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following condition is satisfied:
   0.60&lt; SD/TD&lt; 1.2. 
 
 
     
     
       5. The optical photographing lens assembly of  claim 2 , wherein the fifth lens element has positive refractive power. 
     
     
       6. The optical photographing lens assembly of  claim 3 , wherein the object-side surface of the third lens element is convex in a paraxial region thereof. 
     
     
       7. The optical photographing lens assembly of  claim 3 , wherein the image-side surface of the third lens element is concave in a paraxial region thereof. 
     
     
       8. The optical photographing lens assembly of  claim 4 , wherein a focal length of the optical photographing lens assembly is f, the focal length of the first lens element is f1, and the following condition is satisfied:
   1.0&lt; f/f 1&lt;2.20. 
 
     
     
       9. The optical photographing lens assembly of  claim 4 , wherein an axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, the axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, and the following conditions are satisfied:
     T 12&lt; T 23&lt; T 34; and 
     T 45&lt; T 23&lt; T 34. 
 
     
     
       10. The optical photographing lens assembly of  claim 9 , wherein the axial distance between the first lens element and the second lens element is T12, the axial distance between the fourth lens element and the fifth lens element is T45, and the following condition is satisfied:
     T 45&lt; T 12. 
 
     
     
       11. The optical photographing lens assembly of  claim 1 , wherein a focal length of the optical photographing lens assembly is f, a central thickness of the fourth lens element is CT4, and the following condition is satisfied:
     f/CT 4&lt;25. 
 
     
     
       12. The optical photographing lens assembly of  claim 11 , wherein the focal length of the optical photographing lens assembly is f, the central thickness of the fourth lens element is CT4, and the following condition is satisfied:
     f/CT 4&lt;18. 
 
     
     
       13. The optical photographing lens assembly of  claim 1 , wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are made of plastic material, an axial distance between the object-side surface of the first lens element and the image surface is TL, and the following condition is satisfied:
     TL&lt; 10.0 mm. 
 
     
     
       14. The optical photographing lens assembly of  claim 1 , wherein a half of a maximal field of view of the optical photographing lens assembly is HFOV, and the following condition is satisfied:
   0.20&lt;tan(2× HFOV )&lt;1.20.
 
 
     
     
       15. The optical photographing lens assembly of  claim 1 , wherein a focal length of the optical photographing lens assembly is f, an axial distance between the object-side surface of the first lens element and the image surface is TL, and the following condition is satisfied:
   0.95&lt; f/TL&lt; 1.35. 
 
     
     
       16. The optical photographing lens assembly of  claim 1 , wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, and the following condition is satisfied:
   0.40&lt;( V 2+ V 3+ V 5)/( V 1+ V 4)&lt;0.80. 
 
     
     
       17. The optical photographing lens assembly of  claim 1 , wherein the focal length of the first lens element is f1, the focal length of the third lens element is f3, the axial distance between the image-side surface of the fifth lens element and the image surface is BL, the axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following conditions are satisfied:
   −0.70&lt; f 1/ f 3&lt;0.50; and
 
     BL/TD&lt; 0.50. 
 
     
     
       18. The optical photographing lens assembly of  claim 1 , wherein the axial distance between the second lens element and the third lens element is T23, the axial distance between the third lens element and the fourth lens element is T34, and the following condition is satisfied:
     T 23/ T 34&lt;1.0. 
 
     
     
       19. The optical photographing lens assembly of  claim 1 , wherein the object-side surface of the fourth lens element is concave in a paraxial region thereof, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, and the following conditions are satisfied:
     R 7&lt; R 8; and 
   −1.0&lt;( R 7+ R 8)/( R 7− R 8)&lt;1.0.
 
 
     
     
       20. The optical photographing lens assembly of  claim 19 , wherein the curvature radius of the object-side surface of the fourth lens element is R7, the curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied:
   0&lt;( R 7+ R 8)/( R 7− R 8)&lt;1.0.
 
 
     
     
       21. The optical photographing lens assembly of  claim 20 , wherein the curvature radius of the object-side surface of the fourth lens element is R7, the curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied:
   0.50&lt;( R 7+ R 8)/( R 7− R 8)&lt;1.0.
 
 
     
     
       22. The optical photographing lens assembly of  claim 1 , wherein the object-side surface of the fifth lens element is convex in a paraxial region thereof, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied:
     R 10&lt; R 9; and 
   −1.0&lt;( R 9+ R 10)/( R 9− R 10)&lt;1.0.
 
 
     
     
       23. The optical photographing lens assembly of  claim 22 , wherein the object-side surface of the fifth lens element comprises at least one concave shape in an off-axial region thereof. 
     
     
       24. The optical photographing lens assembly of  claim 22 , wherein the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, and the following condition is satisfied:
   0&lt;( R 9+ R 10)/( R 9− R 10)&lt;1.0.
 
 
     
     
       25. The optical photographing lens assembly of  claim 22 , wherein the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, and the following condition is satisfied:
   −1.0&lt;( R 9+ R 10)/( R 9− R 10)&lt;0.
 
 
     
     
       26. An image capturing device, comprising:
 the optical photographing lens assembly of  claim 1 ; and 
 an image sensor, wherein the image sensor is disposed on the image surface of the optical photographing lens assembly. 
 
     
     
       27. An electronic device, comprising:
 the image capturing device of  claim 26 . 
 
     
     
       28. An optical photographing lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof; 
 a second lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof; 
 a third lens element having an object-side surface and an image-side surface being both aspheric; 
 a fourth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric; and 
 a fifth lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric; 
 wherein, the optical photographing lens assembly has a total of five lens elements, there is an air space between every two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element that are adjacent to each other, a focal length of the first lens element is f1, a focal length of the third lens element is f3, an axial distance between the image-side surface of the fifth lens element and an image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied:
     f 1/ f 3&lt;0.65; 
     BL/TD&lt; 0.80; 
     R 1&lt; R 2; 
     R 7&lt; R 8; and 
     R 10&lt; R 9. 
 
 
     
     
       29. The optical photographing lens assembly of  claim 28 , wherein a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, and the following condition is satisfied:
   1.5&lt;( R 3+ R 4)/( R 3− R 4).
 
 
     
     
       30. The optical photographing lens assembly of  claim 28 , wherein a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, and the following condition is satisfied:
   0.45&lt; CT 4/ CT 5&lt;2.0. 
 
     
     
       31. The optical photographing lens assembly of  claim 28 , wherein a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, and the following condition is satisfied:
   1.1&lt; CT 3/ CT 2. 
 
     
     
       32. The optical photographing lens assembly of  claim 28 , wherein a half of a maximal field of view of the optical photographing lens assembly is HFOV, and the following condition is satisfied:
   0.20&lt;tan(2× HFOV )&lt;1.20.
 
 
     
     
       33. The optical photographing lens assembly of  claim 28 , wherein a focal length of the optical photographing lens assembly is f, an axial distance between the object-side surface of the first lens element and the image surface is TL, and the following condition is satisfied:
   0.95&lt; f/TL&lt; 1.35. 
 
     
     
       34. The optical photographing lens assembly of  claim 28 , wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, and the following condition is satisfied:
   0.40&lt;( V 2+ V 3+ V 5)/( V 1+ V 4)&lt;0.80.
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